We did resolve the problem on non-English Win2K.
Basically, Microsoft no longer supports the DirectX SDK running on Windows 2000. During the beta, I was using a very very old SDK (October 2004) and that one was still compatible.
So the net result is that we will be able to support Windows 2000 non-English but they will have to download a seperate file. I also don't know how long we'll actually be able to keep doing that as it's quite a process to go and do a special build for what is realistically a very small number of people. But we'll worry about that later.
So the bottom line is yes, non-English Windows 2000 users will be able to play GalCiv II but they will have to download a seperate EXE. Why it works on Windows 2000 English without a problem is something only Microsoft can answer.